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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
Snopes, a trusted website that counters urban legend with legitimate research, quickly dismisses the first theoryâthat the grape juice changes the pH to inhibit the virusâarguing that the pH levels in the digestive process are so varied and the virus survives them, so thereâs no way the grape juice could change the pH enough to affect the virus.